Pilot valve structure



Feb. 25, 1941. w. A. RAY

I PILOT VALVE STRUCTURE Filed Feb. 13, 1959 2 Sheets-Sheet l MAL/AM A. 184v,

INVENTOR. X 41.

A TTORNE Y Feb. 25, 1941. W M 2,232,970

PILOT VALVE STRUCTURE Filed Feb. 13, 1939 2 Sheets-Sheet 2 MLL/AMA. QAY,

IN VENTOR.

A TTORNEY Patented Feb.- 25, 1941 v UNITED STATES PATENT OFFICE 2,232,970 PILOT VALVE s'rauc'ruan William A. Ray, Glendale, Calif. Application February 13, 1939, serial No. 256,123

' 4 claims. (.61. 251-156) My present invention relates to fluid control valves and in particular to a pilot valve struc-' u cap member secured-in the mounting whereby;

machining of the opposed mounting is facilitated.

Other objects and advantages of my invention will be found in the description, the draw- 20 lugs and the appended claims.

For complete understanding of the invention,

reference may be had to the following detailed description and accompanying drawings, in which:

25 Figure 1 is a side elevation, partly broken away, of a. fluid pressure operated valve comprising the pilot valve structure or my invention;

I Figure 2 is a section taken along the line 2-,-2o fFig.1;

to Figure 3 is an" enlarged sectional view of the pilot valve structure shown in Fig. 1 and taken alohg-the-line-33 of Fig. 2; J Figure 4 1s "a sectionalview of the valve body shown in Fig. 3; and Q l 3 5 -Flgure '5 isan exploded view in elevation of the valve port members and associated parts or the valve structure shown in Fig. 3. g

In the drawings, the numeral ll generally indicates a fluid pressure operated mainvalve and 40 .the numeral I2 a pilot valve for controlling fluid pressure applied to thediaphragm compartments '0! the main valve and mounted in the upper wall of a'housing l3 which'defmes a pressure compartment above a diaphragm member (not 45 shown) which-is disposed'covering. an opening in the top'wall of themain valve body I4. I

The pilot valve structure I2 is connected by a pipe l5 withthe inlet side of the main valve and below the diaphragm, and a pipe l6 leads from the structure for venting fluid from within the housing in the opening operation of the main valve. Pipe i is connected by passageways in the structure, which will be hereinaiter fully described, with a jet or port member [1,

' u and vent pipe J6 with an opposed port member IS. The end portion of a flat electromagnetically operated armature i9 is alternately movable into and out of contact with the extended ends of the members l1 and I 8 to control fluid flow therethrough, whereby the pressure above and below the main valve diaphragm is varied to open and close the main valve in a manner well known in the art. l r s v An electromagnetic device for operating the f armature l9 comprises a U-shaped core 20 and .an energizing c011 2i.

Aguide for the armature is shown at 22 and the numera123 indicates a stop member'which limits the upward movement of the main valve diaphragm.

A pilot valve body 24, which may preferably be a metal casting, provides integral spaced portions 25 and 26 projecting from one side thereof and having axially aligned passageways 2i and 28' formed therein. I Y

Bosses 29 and 30, having threaded openings 3| and 32 therein adapted to receive hollow screw members 33 and 34 extending through collars 35 and 36, provide means for supporting the pilot valve structure in the wall .of the housing It.

Openings are made in the side walls of the hollow screw members33 and 34 whereby fluid communication is established through them and the collars and 36 between the pipes I5 and I8 and the openings 3| and 32', respectively.

The outer end portion of passageway 21 is 80 threaded to receive a hollow capmember 31 which is internally threaded to receive the inner end portion of the port member II. ,It will 'be noted that thus the member I! is not carried by the body portion 25 directly but through the 35 fmedium of the cap member 31.

A metallic packing member 38," compressed between the inner end of member 31 and a packing nut 39, serves to prevent leakage or fluid between the periphery of member i1 and the wall 4 of passageway 21. This arrangement also serves as means for locking the member H in position after longitudinal adjustment thereof. l

A-lateral opening 40 in the side wall of member 3! permits communication between the opening 3| and the interior of port member 11. The medial portion 4| of passageway 21 is enlarged to provide clearance around'the member 31' so that, in assembly, the opening 40 need not aligned with opening 3|.

Threadedly secured in the body portion 26 is the port member 18, disposed in opposed relation to port member l1. Passageway 28 is enlarged at its inner end 42 to receive a packing member 43 which is compressed by a packing 2. nut ll, carried by member II. o prevent leakage or fluid betweenthe periphery of member It and the wall oi passageway 42, and also to lock the member It in position after flnal longi- '5 tudinal adjustment thereof.

-01 the end portions of these members with which the armature is cooperates is made as small as ispractical so that high contact pressure thereon, with resultant absence of leakage, may be e1- iected with minimum expenditure 01' power in the electromagnetic device. a

An obvious advantage of the pilot valve structure of my invention resides in the ease of machining the body portions from one end to receive parts of uniform size in each of the project as ing portions. .The bores 21 and 42 may be ofthe same diameter so that the packing members 3| and 0 maybe alike. Also, the port members l1 and is may be machined from the same stock and the nuts 39 and It may be identical. All 'this is made possible by arranging the cap member 31 -to indirectly support the port mem-- ber l'linthebodyportion.

'lhegeneral structure oi the .valve shown in Fig. i is claimed in my copending application, gs Serial No. 222.673, filed August 2,- 1938.

It is obvious thatmodifications may be made in the structure which I have shown and described without departing from the spirit of my invention. I intend; therefore, that my inven- 40 time limited only by the scope of the appended Iclaimasmyinvention: I a

1. A iiuid control valve flru'cture comprising a body having a cylindrical passageway therethrough; a hollow cylindrical cap member tightly threadedinoneendoisaidpassageway.theouter end oisaidcap memberbeingclosedgacylindri -cal valve port member, havinga concentric passage adiustably threaded -in the openinner end oisaidcapmember and extending through the other end of said passageway; saidcapmemberhavinganopeningthroughits sidewallwithinsaidpassageway,a ndsaidbody having an opening connecting said passageway withtheextexioroisaidbodmandmeanscooperable with the extended end or said valve memberrorcontmllingfiuidfiowtherethromh. 2.Afiuidcontrolvalvestructurecompflsima cylindrical passageway therethrough; ahollow cylindrical capmembertightly threaded in one end of said passageway, the outer endoi'saidcapmemberbeingcloaed: acylindrical valve port member, having a'concentrie'passa e therethrough, adiustablythreaded in the i5 openinnerendoisaidcapmemberandextending .throughtheotherendoi said passageway; pack- .ingmeansinsaidpassagewayandencircling-said -'valveportmember; meansthreadedonsaidvalve portmemberiorcompressingsaidpackingmeans againsttheinnerendoisaidcapmemberandthe walloisaidpassagewaynaldcapmemberhaving anopeningthroughitssidewallwithinsaidpas- 'sageway, and said body having an opening connectingsaidpassagewaywiththeexterioroisaid body; and means cooperable with the extended 5 end oi. said valve port member for controlling fiuid flow therethrough.

3. A fiuid control valve structure comprising pair of spaced brackets; one of said brackets having a first cylindrical passageway extending 1o 'therethrough; the other or said brackets having a second cylindrical passageway therein, axially aligned with said first passageway, extending through the side of the bracket adjacent said one I oi said brackets; a hollow cylindrical cap member 16 tightly threaded in the outer end of said first passageway, the outer end .01 said cap member being closed; a first cylindrical valve port memher, having a concentric passage therethrough, adjustabiy threaded in the open end of said cap 20 member so that its protruding end isadjacent the other of said brackets; a second cylindrical valve port member, having a concentric passage therethrough, adjustably threaded in the open end of A said second passageway so that its-protruding end 25 is adjacent said first valve port member; said cap member having an opening through its'side wall within said passageway, and said structure having an opening connecting said first passageway with the'exterior oi the structure; said structure so having another opening connecting said second passageway with the exterior of the structure; and means oooperablewith said protruding ends of said valve port members for controlling iiuid flow therethrough: said protrudiing ends 01 said I.

valve port members being accessible .from'the exterior of said structure.

4. A fiuid control valve structure comprising a rigidbodyhavingapairoiadiacentspacedportions integral with and projecting from one side 40 thereof; one-oi said portions having a first cylindrlcal passageway extending therethrough, the other'oi said portions having a second cylindrical passagewaythereinaxiallyalisnedwithsaidfirst.

passagewayandextendingthrollghthesideoi'do packing meansbetweenthewallotsaidfirstpassagewayandtheperlpheryoisaidfirstvalveport member, a secondvalveportmemberhavinga passagetherethrouhandfimdedlyreceivedin .0

s'aidsecond passageway and passageway each-having an opening branching- 'out'thereirom and extending to the exterior-0'! 'inthesidewallthereofcommunicatingwithsaid firstpassageway,andmeansoooperablewithth'e extendedendsoisaidfirstandsaidsecondvalve' port members for controlling fiuid iiowthere- WA. nevi 7'07. 

